On December 8, 2020, Red Hat CTO Chris Wright announced that the popular Linux distribution CentOS will only receive support (and security fixes) until 2021 (instead of the originally announced 2029). Put differently: thousands of CentOS users who counted on the availability of security updates for the foreseeable future are now left in the cold and need to migrate their systems in the next 12 months. While this may sound like a long time, it is actually a gigantic pressure ...

In a blue-green deployment strategy, there are always two instances of your application running in production. A reverse proxy is used to direct traffic to either the green or the blue version. You then deploy changes to your application by first updating the inactive version and then changing the load balancer config to redirect traffic to the updated instance. In this video, I will show you how to set up a very simple version of such a blue-green deployment using ...

Zabbix is a great open source tool to monitor operating system and application metrics. You can install it on your web server and out of the box, it is able to show you fancy graphs for things like: Memory availability CPU usage Disk space usage Network bandwidth Free swap space In this guide, I will show you how to create a dashboard widget that displays the response time for a specific URL over time. You can use this to monitor ...

Learn how to add HTTPS encryption to your Spring Boot application running inside a Docker container. Since the arrival of free Let’s Encrypt certificates, there is really no excuse not to use HTTPS for encrypting your application traffic. Obtaining and integrating a free HTTPS certificate is easy and only requires three simple steps. This article shows the integration for a CentOS 8 web server with a Dockerized Spring Boot application. Registering a Certificate On your web server, obtain certbot, the ...

Oracle is currently offering an always free tier of its compute cloud. In this article, I will show how to register an account, add the free tier units and connect to them via PuTTY on Windows. What is included? While the offer is actually free for an unlimited time, the following restrictions apply: 2 database services are included (ATP serverless and ADW) limited to 1 OCPU and up to 20 GB 2 compute services (1 GB RAM and 1/8 OCPU ...

This is going to be a short one. You may be experiencing troubles when installing Kali Linux via an USB flash drive: You may be inclined to waste a few hours following one of the countless articles suggesting to manually open a shell, change the way your USB stick is mounted and try to fix the issue that way. However, chances are there is a simpler solution in case you are using the popular “LiLi USB Creator” tool on Windows ...

Imagine someone watching all your daily activities from hundreds of meters in the distance. While walls can protect you from spy glasses and interested neighbours looking out of their windows, they are no obstacle for electromagnetic radiation. WiFi networks in particular often build the backbone of our homes’ communication infrastructure: when you come home, your phone connects to your WiFi; when you turn on your video gaming console, it connects to your WiFi; when you leave, the WiFi connection to ...

Bernhard Knasmüller on Software Development